GNU troff (Groff) is the GNU reimplementation of the traditional
general-purpose UNIX typesetting system, roff.

The groff distribution includes:
 * various macro packages including man, mdoc, ms, me, mm, and mom;
 * postprocessors for various output devices, including character
   terminals, X terminals, PostScript, HTML and XHTML, and TeX DVI;
 * and many utility programs.
